The invention provides water wave lattice points in the sight bound of each water wave reflection picture, produces corresponding a third dimensional coordinate according to two-dimensional coordinateof water wave lattice points. The third dimensional coordinate corresponds to the actual height of the water wave. Finally water surface with waves changing is produced according to the third dimensional coordinate. The invention can obtain information of water surface height dynamically, and produce water surface images with light and shadow changing, wherein effects of refraction and reflectionare included, and the produced water surface images are enabled to close to actual condition.